M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:	Glucose oxidase catalyses the conversion of glucose into gluconic acid with a pKa of 3.9. The buffer for glucose oxidase should be at pH 7 to maximize the activity of the enzyme. The gluconic acid produced would predominantly be in which state?

protonated

deprotonated

the protonated and deprotonated states would be roughly equivalent in concentration

there is no relationship between the protonation and the pH of the buffer